<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="count++">{{count}}</button>
        姓：<input type="text" v-model="firstName"> <br>
        名：<input type="text" v-model="lastName"> <br>
        全名：{{FullName}} <br>
        
    </div>
    <script>
        new Vue({
            el: '#app',
            data() {
                return {
                    count: 0,
                    firstName:'',
                    lastName:''
                }
            },
            computed:{
                FullName:{
                    get (){
                        return this.firstName+  "-"  +this.lastName
                    }      
                }
            },
            methods:{
                change(){
                    this.FullName="wang  zhongwang"
                }
            }
        })
    </script>
</body>

</html>